Action vs. Hyperlink: When do I use each option?

Hi! We are currently working on building two courses based on the discovery model - letting the learner drive what content he/she wants to learn first. One course uses hyperlinks to provide the navigation to the learners (we are only using the slide only option); basically we've put an invisible box over the button and used Insert > Hyperlink to link to the destination slide. The other course is built using the Insert > Action option to link the learner to the destination slide.  In both cases we have multiple hyperlinks on one slide.

So far, we've discovered that:

1. When we've used Insert > Hyperlink on an invisible shape over our button, we have no problems with the published output (for web).

2. When we've used Insert > Action on the button itself, the link are not accurate in the published output; they link to other slides, even though when we check the Action info, they are linked appropriately.

Which is the better way? For the Action option, what should we be doing to fix the error? Is there any reason why this would not work?

We want to avoid error and rework in our development phase, so we are trying to figure out what the best practice should be.

Any thoughts or ideas? Thanks!

Nicole